Creality HW Board for Ender-3 Series and high speed Firmware support Marlin and Klipper MCU:STM32F401RE-84MHz Coretx-m4 Kernal 512Kbytes of flash memory 96kbytes of sram Moto Driver:TMC2209 256 microsteps support up to 29VCC Config TMC2209 with usart port